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ACQUISITIONS (Details) $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 29, 2019 USD ($) TankBarge | Mar. 14, 2019 USD ($) bbl Tugboat TankBarge Towboat | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Acquisitions [Abstract] |  |  |  |
Purchase price |  |  | $ 60,932 | $ 40,961
Inland Tank Barges [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Number of maritime vessels acquired | TankBarge | 3 |  |  |
Purchase price | $ 2,970 |  |  |
Cenac Marine Services, LLC [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Prepaid expenses |  | $ 1,138 |  |
Property and equipment |  | 246,802 |  |
Other intangibles |  | 260 |  |
Total assets |  | 248,200 |  |
Other long-term liabilities |  | 3,700 |  |
Net assets acquired |  | $ 244,500 |  |
Weighted average amortization period of intangibles |  |  | 2 years |
Weighted average amortization period of unfavorable contracts |  |  | 1 year 2 months 12 days |
Acquisition related costs |  |  | $ 247 |
Cenac Marine Services, LLC [Member] | Inland Tank Barges [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Average age of property |  |  | 5 years |
Cenac Marine Services, LLC [Member] | Inland Barrel Tank Barges [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Number of maritime vessels acquired | TankBarge |  | 63 |  |
Tank barge barrel capacity (in barrels) | bbl |  | 30,000 |  |
Aggregate tank barge barrel capacity (in barrels) | bbl |  | 1,833,000 |  |
Cenac Marine Services, LLC [Member] | Inland Towboats [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Number of maritime vessels acquired | Towboat |  | 34 |  |
Average age of property |  |  | 7 years |
Cenac Marine Services, LLC [Member] | Offshore Tugboats [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Number of maritime vessels acquired | Tugboat |  | 2 |  |

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